I would like to find the intersection topology errors in a line layer using QGIS 2.18. In the topology checker I found no intersection errors. I know GRASS v.clean and v.build commands can solve these errors. I found that the Merge selected features tool from advanced editing toolbar (as a side effect) breaks intersecting lines and then using Multipart to singleparts from vector menu gives back the original single line features, but this way the attributes are lost.
After selecting all lines and merge them the intersecting lines are broken.
I would like to find a the intersection errors without automatically breaking the lines using QGIS. I need something similar to Topology checker.